[1] Nationwide Childrens Hosp, Ctr Injury Res & Policy, Res Inst, 700 Childrens Dr, Columbus, OH 43205 USA
[2] Dartmouth Coll, Geisel Sch Med, Hanover, NH 03755 USA
[3] Ohio State Univ, Dept Pediat, Coll Med, Columbus, OH 43210 USA
[4] Child Injury Prevent Alliance, Columbus, OH USA